Pantograph engraving-machine



(No Model.)

S. D; ENGLE.

PANTOGRAPH ENGRAVING MACHINE.

No. 246,737. Patented Sept. 6 1881.

Q INVEINITOR: d7) 6 BY A f H K ATTORNEYS.

' WITNESSES:

UNITED STATES PATENT OFFICE.

STEPHEN D. ENGLE, OF HAZLETON, PENNSYLVANIA.

PANTOGRAPH ENGRAVlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 246,737, dated.September 6, 1881.

Application filed April .22, 1881. (No model.)

To all whom it may concern:

Be it known that I, STEPHEN D. ENGLE, of Hazleton, in the county ofLuzerne and State of Pennsylvania, have invented a new and ImprovedPantograph, of which the following is a full, clear, and exactdescription.

My invention relates to pantographs for use in engraving on metal, forreducing maps and drawings, and similar work.

The object of the improvements is to furnish a simple, light, andconvenient apparatus for the purpose stated, which by a change of thetool is adapted for the special work required.

The invention consists in certain novel features of construction in thepantograph proper, and also in devices for regulatingthe pressure of thetool, as hereinafter described and claimed.

In theaccompanying drawings, Figure 1 is a vertical section of thepantograph. Fig. 2 is a front elevation of the same. Fig. 3 is a planview showing the suspension-joints of the main arm. Fig. 4 is ahorizontal section on line m0 of; Fig. 1, and Fig. 5 is a horizontalsection on line y y of Fig. 1.

Similar letters of reference indicate correspondin g parts.

A is an upright frame or standard, which will be rigidly sustained 011 asuitable bed for the work.

B is a bracket, sustained between guides at a on the standard Aby aclamping-screw, b, that passes between the guides, and has a nut orwasher taking behind them, so that the bracket is vertically adjustableon the standard.

0 is a table attached upon brackets B by screws passing into the bracketthrough slots in the table, to allow lengthwise adjustment of the table.

0 is the main arm of the pantograph, suspended from the upper end ofstandard A. On the upper end of the standard a yoke, 07, is hung bypointed screws 6, tapped through opposite ends of the yoke, and theupper end of arm G is forked to pass at opposite sides of the yoke, towhich the forks are pivoted by pointed screws f. These connectionsconstitute a gimbal or universal joint that permits free movement of thearm. The arm 0 is through the slot, so that the slide is adjustablyheld.

D is the'tool-arm, apertured, as shown in Fig. 4, to surround the arm 0and slide z, and attached to the slide by pointed screws 70, whichpermit the arm to swing in a vertical plane. In the forward end of armD, and above table 0, is fitted the graving or other tool or pencil Z.

The tracer-arm E is hung at the lower end of the main arm by screws m,that pass through the forks of the arm 0 into the arm E. At the forwardend of arm E is fitted the tracer a, and at its rear end the tracer-armis formed with lugs or flanges m 'In, between which is hung a lever, 0,that extends to a point near the tracer n so that it may be operatedwith the hand holding the tracer. A rod, p, extends from the back end oflever 0 to the back of the tool-arm D, where it is attached by apivotpin. This rod 1) passes through lever o, and is held thereto bynuts 0 at opposite sides of thelever, so that the rod connects the lever0 and arm D rigidly, and by adjustment of the nuts the length betweenthe two arms can be varied. A spring, g, on the arm E acts to press theforward end of lever 0 upward, and consequently raise the tool [fromtable 0. The movement is limited by a screw, 1', tapped through thelever and bearing on the arm E.

The operation is as follows: The pattern is laid on the bed beneath thetracer n. The tool-arm D is adjusted in the standard A by moving slide?)up or down according to the reduction required. The operatorthen,holding the tracer end of arm E, guides the tracer on the lines ofthe pattern, at the same time presses down the lever 0, and thus bringsthe tool or pencil Z down upon the work on table 0 with the requiredpressure.

The pantograph will do the finest work with great perfection in copying,map-reducing, engraving on metal, and similar work.

The apparatus is simple, easily adjusted, and convenient for use. Whenused for engravin g metal surfaces, the tool and tracer will be retainedwith their faces corresponding by an endless chain running over spikedpulleys. The pulleys will have spikes corresponding in number, so thatthe tool and tracer shall always hold the same relative position.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination of standard A, arm 0, suspended from the standardbydouble-jointed connections, pivoted tool-arm D, pivoted tracerarm E,and work-table c, substantially as shown and described, and arranged foroperation as set forth.

2. The combination of the adjustable slide [0 i, pivoted tool-arm D, andslotted pantographarm 0, substantially as and for the purposes setforth.

3. The combination of lever 0, rod 1), toolarrn D, tracer-arm E, andsuspended arm 0, substantially as shown and described, and ar- IS rangedfor operation as set forth.

STEPHEN D. ENGLE.

Witnesses:

J OHN A. BARTON, O. BACHMAN.

